Well two things to be noted they get to almost 2 feet in length and they are not reef safe. You need to go slap that LFS in the face over selling you this fish. They are also Expert Only fish. They prefer to be fed live shrimp and they grow rather quickly.
Bring it back and have a very stern talking to with that LFS owner :hammer:
i have no personal experience with them, but i stayed at a holiday inn last night :d
That's why I love my LFS, she makes me bring water to test even though they guarantee their fish before I buy anything. She gets a rundown of what you have , fish, corals, equipment before she sells you something that needs extra care. She's a Diamond.
They all SHOULD do this. It is actually in their best interest to make sure all of their customers have successful tanks.